FYI: SymPy doujinshi published at Gijutsushoten 19

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Daiki Takahashi

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Nov 30, 2025, 6:48:41 PM (2 days ago) Nov 30
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Hi all,

Recently, a doujinshi event called Gijutsushoten 19 (技術書典19) was held in Japan.

https://techbookfest.org/event/tbf19

For those unfamiliar with the term: doujinshi are self-published indie books created out of personal passion rather than commercial aims. They aren’t limited to comics or fan works – many are non-fiction, technical, artistic, or entirely original works. Gijutsushoten is an event dedicated exclusively to technical books, and this was its 19th iteration.

I participated as an exhibitor and published a doujinshi about SymPy, so I’d like to share it here.

Python Refactoring Practice: A Practical Walkthrough of Refactoring SymPy
(Python リファクタリング実践記 SymPy をリファクタリングしてみた)
https://techbookfest.org/product/sSYNxpHxmLs9R4cXPeHNah

Note: The book is written in Japanese, so I’m sharing this mainly for your information.

Regarding the proceeds, although modest, I have donated them through NumFOCUS. I wish for the continued growth and success of SymPy.

-- 
haru-44

Aaron Meurer

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10:29 AM (11 hours ago) 10:29 AM
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This is awesome.

I really think it's important for us as software practitioners to
write and reflect about our technical work, whether that's in books,
blog posts, or even just commit messages. It sounds like doujinshi are
also a great avenue for this sort of thing in Japan.

Aaron Meurer
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